Improvement in black-boards



iini tant @anni @Mira- Leners Patent No. 92,533, amd Juzg/'13,11s6a- IIVIPROVEMENT IN BLACK-BOARDS.

The Schedule referred to in tliese Letters Patent fand making part f the same.

To all whom fit may concern Be it known that I, WILLIAM H. JoncKnL, of the city, county, and State of New York, have invented a new and improved Endless Black-Board; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make-and use the same', reference being had to the accompanying drawings, forming part of this specification, in which- Figure l represents a front elevatlon of a frame, provided with my improved black-board.

Figure 2 isAA a vertical transverse section of the same,

taken on the plane of theline :v x, iig. 1.

,Similar letters of reference indicate corresponding` parts. v he object of this invention is to `provide a blackL board for schools, lecture-rooms, 85e., which can be ad just-ed so that marks made upon' its lower part can be elevated to be in sight of the whole "audience, and so that suoli marks which are not used at a certain time may be concealed on the back of the board, to be broughtforward whenever desired for further reference, and Without shifting the frame.

'lh'e invention consists in arranging an endless belt, which has been treated by suitable ingredients, to retain and! display chalk or other marks, and in fitting the same over horizontal rollers, hung in a frame, so Jthat the belt can be readily turned for the aforementioned purpose.

. A, inthe drawing, represents a frame made of wood or other suitable material, of suitable sizev andform,L and supported -or suspended in suitable manner.

In the frame are arranged two rollers, B and O, over which an endless belt, D, is placed, said belt being blackened or otherwise so treated that chalk or other marks made upon it can be easily seen and-readily removed.

The apron, or beltl D is well stretched, 'so that it will be turned when, by means of a crank a, or otherwise, rotary motion is imparted to the lower .or upper roller. One of the rollers should lie in adjustable boxes b b, which can be set, bymeahs of screws o or otherwise, to keep the belt stretched.

Vhen a high frame is used, theI upper part of which cannot conveniently bev reached, it will, with vthis arrangement, be easy to write on the -lower part of the belt, and the to turn the 'roller so that the -Inarks will be carried to the upper part of the frame, where4 they 'can best be seen. l

Such marks as are not usedcan be carried totheV on the arne, to give thebelt a support while it is' being marked.

A small plate, or platform, e, may be arranged on the frame to support chalk, sponge, Snc.

I claim as new, and desire to secure ',byLetters- Patent--` An endless black-board, consisting of the prepared belt D, fitted around rollers, substantially as described. The above specification of my invention, signed by me this 20th dayof January, 1869.

. WM. H. JOEGKEL. Witnesses:

FRANK BLOCKLEY,

E. GREENE COLLINS. 

